Not sure why you need a ne one, but you may find an adsl one in the VM onlien shop.
VM online shop can be found here :-
http://accessories.virginmedia.com/w...e/Default.aspx
Or e-mail tech support if your modem isn't upto the BB speeds you need, and they should order you a new one. I had to and even though it was a two week wait for a reply, it came 24 hours after I recieved their e-mail.
Hope this helps.